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For gaming catalyst is still needed it seems... but the margin is slowly getting smaller between the two drivers. For non gaming use though, the Catalyst just seems laggy on the desktop to me. I'm basically sticking with the 6870 in one of my PCs strictly for the open source driver performance, for some reason it's the best overall.

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If running Unigine Heaven on the open-source drivers with stock settings, don't be fooled by the numbers as tessellation and other functionality isn't in use by the open-source driver compared to Catalyst!

Why can't you compare it with tessellation disabled then?
I see it's quite pointless to even post such results if both drivers technically use different settings.

PS: Again I being upset by fact I have HD6950.

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Possible if you have 2560x1440 display, but for mine 1920x1200 there is only few Linux games actually need more GPU performance than mine 6950 with Radeon and one of them don't even support open source drivers at all.

And if you don't need highest graphics settings and fine about console resolution then most of games works great on low/medium even with Intel HD4600. I personally tested Star Conflict, Wasteland 2 and Valve games. Might be when some new titles release on Linux there will be reason to get faster drivers GPU, but for now it's just useless.